Composition for waterproofing paper



UNITED STATES PATENT OFFICE.

LOUIS BASTET, OF SOUTH ORANGE, NEW JERSEY, ASSIGNOR- TO WILLIAM ROBERTS, OF VVALTHAM, MASSACHUSETTS.

SPECIFICATION forming part of Letters Patent No. 361,041, dated April 12, 1887.

Application filed July 16, 1886. Serial No. 208,212. (X0 specimens.)

ing to circumstances: I take fifty parts mineraloil, eight parts stearic acid, fifty parts tallow, two parts fucus, (Irish moss,) and twenty parts caustic alkali. These ingredients are to be thoroughly mingled by agitation and mixed with the pulp in the engine, using about five to fifteen parts of the mixture to one hundred parts of pulp. When the pulpis well saturated with the mixture, it is to be settled with sulphate of aluminum. The pul thus charged with the water-proof composition is to be subsequentlymauufactured into paper and paperboard in the usual way.

This composition has a material strengthening effect upon the fibers of the paper, and particularly of asbestus stock, and makes tougher and more durable paper for any use.

While I prefer to apply the mixture in the engine, it may be applied by immersing the paper in the mixture subscquentl y to the making of the paper.

I claim as my in-ventiou- The composition of waterproofing ingredients for paper, consisting of mineral oil, stearic acid, tallow, fucus, and caustic alkali, substantially as described.

LOUIS BASTET.

\Vituesses:

W. J. MORGAN, S. H. ll/IORG-AN. 

